A Frenchman helps a Guinean farmer via the Internet, forestry students protest in Ivory Coast, and more

This show is made up entirely of amateur images. We've seen time and time again how images captured by ordinary citizens then uploaded onto the Web can change history, or at least shift the balance of power. This week, we take a look back at some of those moments.

Story 1: France/Guinea

We begin today with an unlikely friendship - between Max, a retiree in France, and Medmo, a young farmer in Guinea Conakry. Medmo is a former chemistry student who dreams of revolutionizing Guinea's agriculture - which is mostly subsistence farming. But he has to learn by running his own farm first. That is where Max comes in. He's never been to Africa, but he's the son of a farmer, he comes from a village famed for its melons - and he has Yahoo Messenger.

Medmo and Max have some good news. They've managed to get some oxen to help till the fields. However, they don't have enough money to buy a plough. If you want to help, get in touch with us via the site, and we'll get your message to them.

Story 2: Ivory Coast

Our next Observer, Lacina, has just finished his studies in Ivory Coast. He chose a career that is pretty specialised - he wants to be a forest ranger. There aren't many employers who hire forest rangers. There's the government... and that's about it. So Lacina and his classmates were more than a little disappointed when not one of them was hired this year by the Water and Forests Ministry. They went to complain, and did not get a good reception.

Story 3: World

And now, some of the most striking images send in from our Observers from around the world this week.

First stop the Central African Republic, with priest Aurélio Gazzera. He recently visited a town called Bohong, the scene of fighting between locals and members of the Seleka rebellion, which took power in March. The fighting began when the soldiers arrested two locals at the market. By the end of it, more than 50 people were dead and thousands of homes burned t othe ground. Aurelio said it was like an apocalypse.

Now to Moscow, with our observer Ilya. He woke up one morning to a bizarre sight... climbers scaling the side of his building. Their target: his balcony! The reason was he had posted a banner for Alexander Navalny., a longtime opponent of Vladimir Putin who was running for mayor. But the current mayor, a Putin supporter, ordered the banners taken down, on grounds that they amounted to campaigning in an unauthorised public space.

Our last stop is Teheran, with our Observer Emi. We agreed to hide her identity, because she likes to wear leggings. In Iran, that can get you arrested by the religious police - because they consider leggings to be un-Islamic. It happened to Emi: she was ordered to change her leggings immediately, or be taken to the station. The battle has gone online, with conservatives creating an "I hate leggings" group on Facebook. There's also an "I *love* leggings" group, of course... with 75,000 'likes' and counting.